package ru.study.thinkin.chapter8;

class Grain {
	public String toString() {
		 return "Grain";
	}
}
class Wheat extends Grain {
	public String toString() {
		return "Wheat";
	}
}
class Mill {
	Grain process() {
		return new Grain();
	}
}
class WheatMill extends Mill {
	Wheat process(){
		return new Wheat();
	}
}

public class CovariantReturn {
	
	public static void main(String[] args) {
		Mill m = new Mill();
		Grain g = m.process();
		System.out.println(g);
		m = new WheatMill();
		g= m.process();
		System.out.println(g);
		

	}

}
